14. (2 pts) What cations are formed in the mass spectrometer by a cleavage of th

Question

14. (2 pts) What cations are formed in the mass spectrometer by a cleavage of the compound below. (circle ALL that apply) ?? A. 124 B. 127 ?. 142 D. 45 E. 83 F. none of the above 15. (2 pts) Primary alcohols often show a peak in their mass spectra at m/z -31. What is the identity of this fragment? A. CH2OH B. CH30 C. CH4CH3 D. [CH2-OH E. CH2OH 16. (2pts) For the following pairs of compounds, choose the bond that would absorb at the higher wavenumber in IR spectroscopy? A. Compound A D, none of the above B. Compound B C, The compounds have identical wavenumbers 17. (2 pts) Which structure best corresponds to the given IR spectra? 0.8 0.6 90.4 0.2 3000 2000 1000 Wavenumber (cm-1) C. OH D

Explanation / Answer

14. Options B and D

15. Option D

16. Option A, with increased mass frequency decrease

17. Option D, an Ester peak at 2985 corresponds CH stretch and at 1740 is due to carbonyl group of ester and the peak at 1200 is due to C-O t

18. Option B, terminal alkyne since it has peaks at 3300 & 2250 for triple bond CH stretch and Carbon - Carbon triple bond

19. Option E, unsaturated ketone, peaks at 3100 for =CH stretch and at 1700 is due to the C=O stretch 1600 for C=C stretch

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